fentanyl is getting into the united states, through the mail ordered online. take a look at how it works. in montgomery county, ohio, what local officials call the overdose capital of america, the sympathetic opioid fentanyl is causing carnage like america has never seen, and law enforcement says it's just a click away on the internet. >> they can order it from china and they'll mail it to your house. >> so you're telling people are actually sitting at home and going on their computer and they're getting mailed pagz of fentanyl. >> yeah. typically they mail them to a vacant house. >> back at my desk at the nbc news los angeles bureau we decided to put that for the tegs. >> wooes we're just going to try. >> buy fentanyl. >> here. so here. the first thing that poms up on the top is three 3m if you are an fentanyl from china labs.